I suppose that the month Equos had regularly twenty-nine days instead of thirty, and that the attribution of thirty days to it is an error of the scribe or mason who engraved the calendar.
But the month Equos has attached to it the sign ANM, which is attached to all the months of twenty-nine days but to none of the months of thirty days except Equos, all of which, except Equos, are marked with the sign MAT.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "equos" in a variety of sentences. We hope that you will now be able to make sentences using this word.